Main-Chain Oligomers from Ni-II- and Cu-II-Centered Unsymmetrical N2O2 Schiff-Base Complexes: Synthesis and Spectral, Structural, and Second-Order Nonlinear Optical Properties

Celedon, S.; Dorcet V.; Roisnel T.; Singh, A; Ledoux-Rak, I; Hamon, JR; Carrillo, D.; Manzur, C

Keywords: copper, schiff bases, oligomers, nonlinear optics, nickel, N,O ligands

Abstract

Oligomeric main-chain Schiff-base compounds 4 and 5 have been synthesized by the trans-esterification of their respective doubly functionalized monomeric precursors [M((eta(5)-C5H5)Fe(eta(5)-C5H4)C(=O)CH=C(4-C6H4OH)NCH2CH2N= CH-(2-O,4-CO2H-C6H3)}] [M = Ni (2), Cu (3)] in dmf. The new compounds were characterized by elemental analysis, ETIR and multidimensional NMR spectroscopy, mass spectrometry, and cyclic voltammetry. Compounds 2, 3, and 6, the corresponding amide of 2, were characterized by X-ray structural investigation. Gel permeation chromatography estab- fished that oligomers 4 and 5 are formed of approximately six monomeric units, and differential scanning calorimetry and thermal gravimetric analysis indicated that they are thermally stal)le with decomposition temperatures exceeding 230 degrees C. Harmonic light scattering measurements showed. that compounds 2-5 exhibit.rather high second-order.noidinear responses, between 224 x 10(-30) and 399 x 10(-30) esu, with hyperpolarizability beta(1.91) values that increase significantly on passing from the monomeric to the oligomeric species.

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Título según WOS: Main-Chain Oligomers from Ni-II- and Cu-II-Centered Unsymmetrical N2O2 Schiff-Base Complexes: Synthesis and Spectral, Structural, and Second-Order Nonlinear Optical Properties
Título de la Revista: EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
Número: 29
Editorial: WILEY-V C H VERLAG GMBH
Fecha de publicación: 2014
Página de inicio: 4984
Página final: 4993
Idioma: English
DOI:

10.1002/ejic.201402469

Notas: ISI